Sheet-leader block.



No. 719,124. PATENTBD JAN. 27, 1903;

w. H. MARSHALL. SHEET LEADER BLOCK.

APPLICATION FILED OUT. 30, 1902. 30 MODEL.

o tical position.

tlni'trhn Marne t; tries.

WILLIAM H. MARSHALL, OF Y VAKEFIELD, MASSACHUSETTS, ASSIGNOR OF ONEJIALE TO THE MARINE HARDWARE COMPANY, A CORPORATION OF MAINE.

SHEEP-LEADER BLOCK.

SPECIFICATION forming part of Letters Patent No. 719,124, dated January 27, 1903. Application filed October 30, 1902. Serial No. 129,413. (No model.)

leader blocks in which the sheave-frame or pulley-frame is supported when the sheet is slackened, and thus prevented from dropping over upon the deck and marring it.

My invention has for its principal objects to produce a sheet-leader block which is simple in construction, which is economical to manufacture, in which the number of parts is reduced to a minimum, and in which a rotative shell or guard-plate for supporting the sheave-fran1e is done away with, and hence the danger of breakage, always present when such a guard-plate is employed, is obviated.

The nature of the invention is fully described below and illustrated in the accompanying drawings, in which- Figure 1 is an elevation of my improved sheet-leader block, the sheave-frame being shown in full lines dropped to one side, as when not in use, and in dotted lines in a ver- Fig. 2 is a horizontal section taken on line 2, Fig. 1. Fig. 3 is a vertical section taken on line 3, Fig. 1.

Similar letters of reference indicate corresponding parts.

a represents the base-plate, preferably circular in form and adapted to be secured to the deck I) by a suitable number of screws 0. This base-plate is provided with a central hole 01 and is formed up into a circular vertical flange e, which is concentric with the periphery of the base-plate and is provided on its inner surface with a horizontal groove f.

9 represents a plug resting on that portion of the plate a which lies between the vertical flange e and the hole d, adapted to be rotated freely within said flange. This plug is provided with a peripheral groove 71., which registers with the groove f and which contains a spring 70, which extends from the groove h into the groove f and prevents the plug from being withdrawn without interfering with its rotation. This spring is preferably formed at its under outer corner with the bevel k to facilitate its being compressed and slipped with the plug into position inside the flange. The upper end of the plug is formed into ears h, which are provided with the horizontal pivot-pin Z, which supports a swinging link m, whose outer end has a suitable eye, through which the lower end a of the sheave-frame n loosely extends.

p is the pulley.

As above mentioned, the plug g is rotatively secured to and within the flange 6, extending up from the base-plate Cb bya spring f. The pulley is therefore free to swing in any direction. Then the sheet is slackened, the sheave-frame rests upon the upper edge of the flange e out of contact with the deck. There is no rotative guard-plate necessary for holding up the sheave-frame, and hence there is no guard or plate of any kind which extends over toward or around the edge of the base-plate, such a guard or plate, which is liable to become broken, being entirely done away with.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a sheet-leader block, the base-plate provided with the substantially vertical annular flange e; a plug rotatively supported by the base-plate within said flange; a sheaverame and pulley; and a pivotal connection between the plug and the sheave-frame, substantially as described.

2. 'In a sheet-leader block, the base-plate provided with the substantially vertical annular flange 6 formed with the internal groove f; the plug g supported by the base-plate within said flange and provided with the annular groove h; the spring 7:; within said grooves; a sheave-frame and pulley; and a pivotal connection between the plug and the sheave-frame, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

- WILLIAM H. MARSHALL.

Witnesses:

HENRY W. WILLIAMS, A. K. Hoon. 

